Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27330 results found.

  1. GRB 221226B: VLT/X-shooter redshift and host galaxy
  2. GRB 221226B: Swift detection of a burst
  3. GRB 221226B: Fermi GBM Final Real-time Localization
  4. Swift GRB221226.95: Global MASTER-Net observations report
  5. Fermi GRB 221226A: Global MASTER-Net observations report
  6. GRB 221226A: Fermi GBM Final Real-time Localization
  7. Fermi GRB 221223A: Global MASTER-Net observations report
  8. IceCube Alert 221224.04: Global MASTER-Net observations report
  9. GRB 221223A: Fermi GBM Final Real-time Localization
  10. IceCube Alert 221223.32: Global MASTER-Net observations report
  11. Fermi GRB 221221A: Global MASTER-Net observations report
  12. GRB 221221A: Fermi GBM Final Real-time Localization
  13. GRB 221216A: Detection by VZLUSAT-2
  14. GRB 221218A: MITSuME Akeno optical upper limits
  15. GRB 221215A: Fermi GBM Detection
  16. Integral GRB221218.34: Global MASTER-Net observations report
  17. GRB 221216A: Swift/UVOT Upper Limits
  18. GRB 221216A: Fermi GBM observation
  19. GRB 221216A: Swift-XRT refined Analysis
  20. IceCube Alert 221216.25: Global MASTER-Net observations report
  21. GRB 221216A: AKO Upper Limit
  22. Swift GRB 221216A: Global MASTER-Net observations report
  23. GRB 221216A: Zadko observatory - Gingin optical observations
  24. GRB 221216A: Nanshan/NEXT optical upper limits
  25. GRB 221216A: Swift detection of a burst
  26. GRB 221216A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 692760884: Global MASTER-Net observations report
  28. GRB 221215A: Swift/BAT-GUANO arcminute localization
  29. Fermi GRB 221215B: Global MASTER-Net observations report
  30. IPN triangulation of GRB 221209A (long)
  31. GRB 221215B: Fermi GBM Final Real-time Localization
  32. Fermi Gamma-ray Burst Monitor trigger 692760884/221215066 is not a GRB
  33. Swift GRB221215.15: Global MASTER-Net observations report
  34. Fermi trigger No 692713692: Global MASTER-Net observations report
  35. GRB 221215A: Fermi GBM Final Real-time Localization
  36. Swift Trigger 1144538 is not a GRB
  37. Fermi Gamma-ray Burst Monitor triggers 692721536/221214610 and 692713692/221214520 are not GRBs
  38. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  39. Fermi trigger No 692607435: Global MASTER-Net observations report
  40. GRB 221209A: CALET Gamma-Ray Burst Monitor detection
  41. GRB 221212A: Fermi GBM Final Real-time Localization
  42. Fermi GRB 221211A: Global MASTER-Net observations report
  43. GRB 221211A: Fermi GBM Final Real-time Localization
  44. IceCube Alert 221210.36: Global MASTER-Net observations report
  45. GRB 221009A: MuSCAT3 observations
  46. GRB 221210A: Fermi GBM Final Real-time Localization
  47. GRB 221209B: Fermi GBM Final Real-time Localization
  48. GRB 221209A: Fermi GBM observation
  49. GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243)
  50. GRB 221209A: Fermi GBM Final Real-time Localization
  51. GRB 221206B: Fermi GBM observation
  52. GRB 221206B: Detection by GRBAlpha
  53. GRB 221206B: Swift/BAT-GUANO candidate arcminute localization
  54. Swift/BAT trigger #1143281 is not a GRB
  55. GRB 221206C: Fermi GBM Final Real-time Localization
  56. GRB 221206B: Fermi GBM Final Real-time Localization
  57. GRB 221206A: Fermi GBM Final Real-time Localization
  58. GRB 221205A: Fermi GBM Final Real-time Localization
  59. Swift GRB221204.45 AKO Upper Limit
  60. GRB 221202B: Detection by VZLUSAT-2
  61. Swift GRB221204.45: Global MASTER-Net observations report
  62. GRB 221203B: Fermi GBM Final Real-time Localization
  63. GRB 221202A: Swift/UVOT Detection
  64. GRB 221202A: Swift-BAT refined analysis
  65. GRB 221201A: Swift-BAT refined analysis
  66. GRB 221203A: Fermi GBM Final Real-time Localization
  67. GRB 221201A: Fermi GBM observation
  68. GRB 221202A: Swift-XRT refined Analysis
  69. GRB 221202A: LCOGT Optical Upper Limits
  70. GRB 221202A: MeerLICHT upper limits
  71. GRB 221202B: Fermi GBM Final Real-time Localization
  72. GRB 221202A: Swift detection of a burst
  73. Swift GRB221202.84: Global MASTER-Net observations report
  74. GCN: GRB 221201A: Swift/UVOT Upper Limits
  75. GRB 221201A: Swift-XRT refined Analysis
  76. Swift GRB 221201A: Global MASTER-Net observations report
  77. GRB 221201A: Swift detection of a burst
  78. GRB 221201A: Fermi GBM Final Real-time Localization
  79. Fermi Gamma-ray Burst Monitor trigger 691534074/221130867 is not a GRB
  80. Optical polarization observation of GRB 221009A
  81. GRB 221126A: Fermi GBM observation
  82. GRB 221127A: Detection by GRBAlpha
  83. Alert from the HAWC Burst Monitor HAWC-221128A
  84. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  85. GRB 221126A: Fermi GBM Final Real-time Localization
  86. GRB 221124A: Swift/BAT-GUANO detection
  87. GRB 221124A: CALET Gamma-Ray Burst Monitor detection
  88. IceCube Alert 221124.66: Global MASTER-Net observations report
  89. GRB 221120A: TURBO Optical Upper Limit
  90. GRB 221122A: Detection by GRBAlpha
  91. Alert from the HAWC Burst Monitor HAWC-221123A
  92. GRB 221121A: CALET Gamma-Ray Burst Monitor detection
  93. GRB 221009A：DAMPE observed a 34.7 GeV photon at 1.36 hour after the GBM trigger
  94. IPN triangulation of GRB 221121A (long)
  95. GRB 221120A: Swift-BAT refined analysis
  96. GRB 221120A: AKO Telescope Upper Limits
  97. GRB 221120A: Liverpool Telescope Upper Limits
  98. GRB 221120A: Fermi GBM observation
  99. GRB 221120A: Swift-XRT refined Analysis
  100. GRB221120A: Montarrenti Observatory Upper Limit

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov